CN106915324B

CN106915324B - Airbag device

Info

Publication number: CN106915324B
Application number: CN201610952154.XA
Authority: CN
Inventors: 铃木基继
Original assignee: Subaru Corp
Current assignee: Subaru Corp
Priority date: 2015-12-24
Filing date: 2016-10-27
Publication date: 2020-05-15
Anticipated expiration: 2036-10-27
Also published as: US20170182967A1; US10618493B2; CN106915324A; JP2017114250A; DE102016123988A1; JP6267181B2

Abstract

The invention aims to provide an airbag device which prevents the visual field of a driver from being deteriorated due to the expansion of a front pillar and is suitable for oblique collision. In an airbag device (11), a curtain bag body (12) has: the main chamber area (12A) is mainly arranged below the upper side beam (10), and the sub-chamber area (12B) is positioned at the front side of the main chamber area (12A) and is mainly arranged below the A column (6). The sub-room region (12B) is folded back to the upper side of the vehicle (1) and is fixed to the A-pillar (6) by a tab (14). With this configuration, the thickness of the curtain bag body (12) when folded is reduced on the front side of the vehicle (1), and an airbag device (11) that can prevent the expansion of the A-pillar (6) and cope with an oblique collision is realized.

Description

Airbag device

Technical Field

The present invention relates to an airbag device installed in a vehicle such as an automobile, and more particularly to an airbag device that prevents deterioration of a driver's field of vision due to expansion of a front pillar and that copes with an oblique collision.

Background

In recent years, vehicles having curtain airbags that protect the heads of occupants at the time of a collision or the like have become widespread. A general curtain airbag is configured to protect the head of an occupant by housing the curtain airbag from the inside of a front pillar trim across the inside of a roof trim and by deploying the curtain airbag along a side window glass during a vehicle collision or the like.

In addition, some national laws also require a countermeasure against being thrown out of the vehicle when the vehicle is turned over, and the curtain airbag is effective as the countermeasure. The following patent documents disclose shapes of curtain airbags for protecting the heads of occupants.

First, fig. 6(a) shows a state in which the airbag 42 of the head-protecting airbag device 41 is inflated and deployed. The airbag 42 has: a protective portion 43 that covers the vehicle interior side of the window; and an auxiliary inflating portion 44 that inflates adjacent to the vehicle interior side of the protecting portion 43 on the lower side that becomes the lower end portion 43A side of the protecting portion 43. The airbag 42 has a rectangular shape, and the auxiliary inflating portion 44 is disposed along a long side (a side in the vehicle front-rear direction) thereof.

Fig. 6(B) shows a cross-sectional view of the airbag 42 shown in fig. 6(a) taken along the line a-a, and the auxiliary inflating portion 44 is folded back such that the upper end portion 44A side thereof inflates and deploys toward the vehicle upper side. Further, the head of the occupant is also prevented from sliding to the lower side than the lower end position of the window (for example, refer to patent document 1).

Next, fig. 7(a) shows a state in which the curtain airbag 52 of the side curtain airbag module 51 is inflated and deployed. The curtain airbag 52 has: a main chamber 53 having a plurality of expansions; and a front chamber 54 disposed in front of the main chamber 53. One end of a tether 55 is fixed to the front end side of the curtain airbag 52, and the other end of the tether 55 is fixed to an a-pillar 56. Then, the front chamber 54 is inflated and deployed so as to cover the vehicle interior side of the tether 55.

Fig. 7(B) shows a state in which the curtain airbag 52 is folded and stored in the a-pillar 56 and the roof side rail 57. Initially, the front chamber 54 is folded back toward the main chamber 53, and then the curtain airbag 52 is folded upward in a zigzag or bellows shape in a state where both the

chambers

53 and 54 are overlapped (for example, refer to patent document 2).

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent application publication No. 2010-36795

Patent document 2: japanese unexamined patent application publication No. 2010-202187

As a general measure of an airbag device that copes with an oblique collision, it is conceivable to enlarge an airbag. However, since the base fabric of the airbag is large, it is necessary to increase the gas generator power, which causes a problem that the gas generator device is large in size and the space in the vehicle interior becomes small. Further, the base fabric of the airbag becomes large, the size of the inflator becomes large, and the cost is increased.

In the head-protecting airbag device 41 described in patent document 1, the airbag 42 includes the protecting portion 43, and the auxiliary inflating portion 44 is provided on the lower end portion 43A side of the protecting portion 43. The auxiliary inflating portion 44 is disposed along the long side of the airbag 42.

For example, in order to protect the head of a person sitting in the driver's seat or the passenger's seat during an oblique collision, it is desirable to dispose the airbag 42 further forward in the vehicle. In this case, as described above, the base fabric of the airbag 42 becomes large, etc., thereby causing problems of a small vehicle interior space and an increase in cost.

Further, since the airbag 42 is folded and stored in the roof side rail, and the protecting portion 43 and the auxiliary inflating portion 44 are arranged to overlap with each other all the way to the vehicle front side of the airbag 42, the thickness of the airbag 42 becomes thick at the time of folding.

Further, since the folded airbag 42 is disposed up to the a-pillar, the a-pillar expands due to the thickness of the airbag 42. This structure improves the reliability of protecting the head of a person seated in the driver's seat or the passenger's seat, but causes a new problem that the a-pillar obstructs the field of vision of the driver during traveling, and deteriorates safety during traveling.

In the side curtain airbag module 51 described in patent document 2, the curtain airbag 52 includes a main chamber 53 and a front chamber 54, and the front chamber 54 is disposed in front of the main chamber 53.

However, since the front chamber 54 is folded back toward the main chamber 53 and then folded and stored together with the main chamber 53, the thickness of the overlapping region of the both

chambers

53 and 54 becomes large. Further, since the overlap region is disposed on the front end side of the curtain airbag 52 and is housed in the a pillar 56, the a pillar 56 is enlarged. As a result, as described above, the a-pillar 56 obstructs the field of view of the driver, and a new problem arises in that safety during traveling deteriorates.

The main chamber 53 and the front chamber 54 are arranged in a line along the front-rear direction of the vehicle, and a recessed region 58 is formed at the front end of the main chamber 53 and above the front chamber 54. This structure may cause the head of a person sitting in the driver seat or the passenger seat to enter the recessed area 58 during an oblique collision, and the head may rotate in the yaw (ヨー) direction.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide an airbag device that prevents deterioration of a driver's visual field due to enlargement of a front pillar and that can cope with an oblique collision.

An airbag device according to the present invention is characterized by comprising: a curtain bag body disposed along the roof side rail from a front pillar of the vehicle; and a tab (タグ) that secures the curtain pocket to the front pillar and the roof rail, wherein the curtain pocket has: a first region portion in which a first expansion portion arranged below the roof side rail is formed; and a second region portion in which a second expansion portion that communicates with the first expansion portion and is disposed on the front pillar side of the first expansion portion is formed, the second region portion being folded back such that a part of the second expansion portion overlaps with the first expansion portion in the vehicle width direction of the vehicle, and being fixed to the front pillar by the tab.

Further, an airbag device according to the present invention is characterized in that: the curtain bag body has a region in which the first region and the second region overlap in an intermediate portion thereof, and the first region and the second region are separately disposed in other regions.

Further, an airbag device according to the present invention is characterized in that: the second region portion is folded back toward an inside in a vehicle width direction of the vehicle.

Further, an airbag device according to the present invention is characterized in that: the second region portion is folded back toward the vehicle outer side in the vehicle width direction of the vehicle.

Effects of the invention

In the airbag device of the present invention, the curtain bag body includes: a first region part in which a first expansion part arranged below the roof side rail is formed; and a second region portion in which a second expansion portion disposed on the front pillar side is formed. The second region portion is folded back upward of the vehicle so that the first region portion and a part of the second region portion overlap each other, and is fixed to the front pillar. With this configuration, when the curtain bag body is folded, the region where the curtain bag body becomes thick can be reduced, and the expansion of the front pillar can be prevented, thereby realizing an airbag device that can cope with an oblique collision.

In the airbag device of the present invention, the region where the curtain bag body becomes thick when the curtain bag body is folded is disposed in the middle portion of the curtain bag body. Therefore, the curtain bag body is thin at the front end side of the curtain bag body. With this configuration, the front pillars are prevented from being enlarged, the driver's view is less likely to be obstructed by the front pillars, and safety during traveling is improved.

In the airbag device of the present invention, the second region is folded back toward the vehicle interior side, so that the curtain bag body on the vehicle front side is inflated and expanded in a thick manner in the vehicle width direction. Therefore, the first region and the second region form a recess (ポケット) region, so that the head of the occupant can be received and supported during an oblique collision, and the head of the occupant can be prevented from rotating in the yaw direction.

In the airbag device of the present invention, the second region is folded back toward the vehicle cabin outer side, whereby the curtain bag body on the vehicle front side is inflated and expanded in a thick manner in the vehicle width direction. Therefore, the protruding region is formed by the first region portion and the second region portion, so that the head of the occupant can be received and supported at the time of an oblique collision, and the head of the occupant can be prevented from rotating in the yaw direction.

Drawings

Fig. 1 is a view showing an attachment structure of an airbag device according to embodiment 1 of the present invention, and is a side view showing a state in which the airbag device is attached to a vehicle;

fig. 2(a) is a side view illustrating a state when the airbag device according to embodiment 1 of the present invention is inflated and deployed, fig. 2(B) is a side view illustrating a state before the curtain bag body shown in fig. 2(a) is attached to a vehicle, and fig. 2(C) is a plan view illustrating a state when the airbag device on the driver's seat side is inflated and deployed;

fig. 3(a) is a side view illustrating a state when the airbag device according to embodiment 2 of the present invention is inflated and deployed, and fig. 3(B) is a plan view illustrating a state when the airbag device on the driver's seat side is inflated and deployed;

fig. 4(a) is a side view illustrating a state when the airbag device according to embodiment 3 of the present invention is inflated and deployed, fig. 4(B) is a side view illustrating a state before the curtain bag body shown in fig. 4(a) is attached to a vehicle, and fig. 4(C) is a plan view illustrating a state when the airbag device on the driver's seat side is inflated and deployed;

fig. 5(a) is a side view illustrating a state when the airbag device according to embodiment 4 of the present invention is inflated and deployed, and fig. 5(B) is a plan view illustrating a state when the airbag device on the driver's seat side is inflated and deployed;

fig. 6 is a view showing a conventional airbag device, fig. 6(a) is a side view illustrating a state when the airbag device is inflated and deployed, and fig. 6(B) is a cross-sectional view showing a cross section in a line a-a of fig. 6 (a);

fig. 7 is a view showing a conventional airbag device, fig. 7(a) is a side view explaining a state when a curtain member is inflated and deployed, and fig. 7(B) is a side view explaining a state when the curtain member is stored.

Description of the symbols

1 vehicle

2 vehicle body side wall

6A column

10 roof side rail

11 airbag device

12 curtain type bag body

12A main chamber area

12B subchamber region

14 contact piece

17 expansion part

18 non-expanding portion

19 overlap region

22 head

23 region of recess

24 projected area

31 curtain type bag body

31A main chamber region

31B subchamber region

32 recessed area

33 head part

34 projected area

Detailed Description

An airbag device according to embodiment 1 of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is a side view seen from the vehicle interior side for explaining an outline of a mounting structure of an airbag device. Fig. 2(a) is a side view as viewed from the vehicle interior side for explaining a state when the curtain bag body is inflated and expanded, fig. 2(B) is a side view for explaining a state before the curtain bag body shown in fig. 2(a) is attached to the vehicle, and fig. 2(C) is a plan view for explaining a state when the curtain bag body on the driver seat side is inflated and expanded.

As shown in fig. 1, a vehicle 1 according to the present embodiment is, for example, a passenger-cargo dual-purpose vehicle having 3 rows of seats in the front-rear direction of the vehicle 1, and a vehicle body side wall 2 is formed with: a front door opening 3 corresponding to the 1 st row seat, a rear door opening 4 corresponding to the 2 nd row seat, and a window opening 5 corresponding to the 3 rd row seat. The vehicle 1 is not limited to a 3-row seat vehicle, and may be a 2-row seat vehicle.

Further, the vehicle body side wall 2 is provided with, from the front side of the vehicle 1: a front pillar 6 (hereinafter referred to as "a-pillar 6"), a center pillar 7 (hereinafter referred to as "B-pillar 7"), a side sill pillar 8 (hereinafter referred to as "C-pillar 8"), and a rear pillar 9 (hereinafter referred to as "D-pillar 9"), and upper portions of these pillars 6 to 9 are joined to a roof side sill 10 extending in the front-rear direction of the vehicle 1.

The airbag device 11 mainly has: a curtain bag body 12, a gas generator 13 for supplying gas to the curtain bag body 12, a fixing tab 14 for attaching the curtain bag body 12 in a folded and stored state to the vehicle body side wall 2, and a strap 15 for restricting the movement of the curtain bag body 12.

The curtain bag body 12 is a fabric bag body formed in a substantially rectangular shape that is long in the front-rear direction of the vehicle 1 when inflated and expanded, and is normally kept in a state folded into a roll shape that is wound thin in the vertical direction. The curtain bag 12 is disposed along the a-pillar 6 and the roof side rail 10, and is fixed to the vehicle body side wall 2 by a fixing tab 14. The curtain bag 12 is provided with a gas introduction portion, and the curtain bag 12 is connected to a gas generator 13 fixed to the roof side rail 10 through the gas introduction portion.

The curtain bag body 12 is not limited to being folded in a roll shape, may be folded in a bellows shape, and may be a combination thereof.

In the airbag device 11, in an emergency such as a collision or a rollover of the vehicle 1, high-pressure gas is ejected from the gas generator 13 into the curtain bag 12, and the curtain bag 12 expands and spreads in a curtain shape between the vehicle body side wall 2 and the head of the occupant, thereby protecting the head of the occupant.

The belt 15 is, for example, a cloth belt-shaped member, is disposed to be inserted through a ring portion of a bracket 16 fastened to the a pillar 6 by a bolt, and is connected to the curtain bag body 12 on the front side of the vehicle 1. When the curtain bag 12 is expanded and expanded, the curtain bag 12 on the front side of the vehicle 1 is restricted to maintain a twisted state.

Fig. 2(a) shows a state in which the curtain bag 12 is expanded and unfolded. The curtain bag body 12 is a substantially rectangular bag body that is long in the front-rear direction of the vehicle 1, and is inclined obliquely downward toward the front side of the vehicle 1, as in a western substantially L-shape. In addition, in the region along the roof side rail 10, the linear portion of the curtain bag body 12 is fixed to the roof side rail 10 by a plurality of fixing tabs 14.

On the other hand, in the region along the a pillar 6, the inclined portion of the curtain bag body 12 is folded back from the vehicle interior side to the upper side of the vehicle 1, and is fixed to the a pillar 6 by 2 fixing tabs 14 disposed on the front end side thereof. That is, the curtain bag body 12 is disposed in the vehicle 1 in a state of being twisted on the front side of the vehicle 1.

Fig. 2(B) shows a state in which curtain bag 12 is unfolded before being mounted on vehicle 1. The curtain bag body 12 has an inflated portion 17 into which gas from the gas generator 13 (see fig. 1) flows and is inflated, and a non-inflated portion 18 into which gas does not flow and which is not inflated and expanded. The non-inflatable portion 18 is disposed around the end of the curtain bag body 12 so as to surround the inflatable portion 17, for example.

The curtain bag body 12 has: a main chamber area 12A mainly disposed below the roof side rail 10, and a sub-chamber area 12B located at the front side of the main chamber area 12A and mainly disposed below the A-pillar 6.

The main chamber region 12A and the sub-chamber region 12B are provided with the inflatable portion 17 in communication with each other, and in the boundary region, the non-inflatable portion 18 protrudes downward from the upper end portion of the curtain bag body 12, and the inflatable portion 17 is narrowed.

Dashed line 20 indicates the fold line of curtain pouch 12. As shown in fig. 2(a), in the overlapping area 19 of the main chamber area 12A and the sub-chamber area 12B, the overlapping area of the expanded portions 17 with each other is narrowed, and the overlapping area of the expanded portions 17 and the non-expanded portions 18 is widened.

The base fabric of the non-expansion portion 18 is smaller than the expansion portion 17, and the non-expansion portion 18 is arranged to be wider in the overlapping region 19, whereby the thickness of the folded curtain bag body 12 becomes thinner, and the region where the curtain bag body 12 becomes thicker becomes smaller.

As shown in fig. 2(a), the sub-chamber region 12B is disposed separately from the overlap region 19 to the front side of the vehicle 1.

With this structure, the thickness of the folded curtain bag body 12 becomes thicker in the overlapping region 19, but becomes thinner at positions closer to the front and rear of the vehicle 1 than the overlapping region 19, and the thicker region becomes shorter than the conventional folded-back structure shown in fig. 6 and 7. As shown by the circular mark 21 (see fig. 1), the area of the overlap area 19 where the curtain bag body 12 has the greatest thickness is provided at the roof side rail 10 or the a pillar 6 near the roof side rail 10.

That is, the thickness of the folded curtain bag body 12 becomes thin at the a-pillar 6 in the region that is easily accessible to the driver's view, whereby the a-pillar 6 accessible to the driver's view can be prevented from being enlarged. Therefore, the field of vision of the driver is not easily obstructed by the a-pillar 6, and deterioration of safety during traveling is prevented. Also, the view of the person sitting in the front passenger seat is not easily obstructed, and the person can easily enjoy the outside view while driving.

Fig. 2(C) shows the movement of the head of the occupant on the driver seat side at the time of inflation and deployment. As described above, the curtain bag body 12 is disposed in the vehicle 1 in a state of being bent and twisted toward the vehicle interior side at the front side of the vehicle 1. When the curtain bag body 12 expands and expands due to an oblique collision, the sub-chamber region 12B is located inside the vehicle interior compared to the main chamber region 12A.

As shown in fig. 2(a) and (B), the main chamber region 12A and the sub-chamber region 12B have the inflatable portion 17 over substantially the entire portion in the short side direction (vertical direction of the vehicle) of the curtain bag body 12. The main chamber region 12A and the sub-chamber region 12B are in contact with each other in the overlapping region 19 so as to overlap each other in the vehicle interior direction, and the curtain bag body 12 is expanded and expanded thick toward the front side of the vehicle 1. Then, a recessed region 23 for receiving the head 22 of the occupant is formed in the overlapping region 19 of the main chamber region 12A and the sub-chamber region 12B.

With this structure, when the head 22 of the occupant moves toward the outside of the vehicle compartment due to an oblique collision, the head 22 of the occupant can be received and supported in a substantially front state by the recessed region 23. Further, the head 22 of the occupant is prevented from rotating in the yaw direction, and the head 22 of the occupant can be more reliably protected.

An airbag device according to embodiment 2 of the present invention will be described in detail below with reference to the drawings.

Fig. 3(a) is a side view as viewed from the vehicle interior side for explaining a state when the curtain bag body is inflated and expanded, and fig. 3(B) is a plan view for explaining a state when the curtain bag body on the driver seat side is inflated and expanded.

In this embodiment, compared with embodiment 1 described with reference to fig. 1 and 2, the point is that the curtain bag 12 is bent outward from the vehicle interior, and the other structures such as the structure of the curtain bag 12 are the same as embodiment 1. Therefore, the same reference numerals are used for the same components as those in embodiment 1 described with reference to fig. 1 and 2, and the description thereof will be omitted.

As shown in fig. 3(a), in the present embodiment, the sub-chamber region 12B of the curtain bag body 12 is folded back from the vehicle interior side to the upper side of the vehicle 1, and is fixed to the a pillar 6 by 2 fixing tabs 14 disposed on the front end side.

As shown in fig. 3(B), when the curtain bag body 12 expands and expands due to an oblique collision, the sub-chamber region 12B is expanded in a twisted state so as to be located outside the vehicle interior with respect to the main chamber region 12A. The sub-chamber region 12B moves the main chamber region 12A toward the vehicle interior, and is therefore effective also in a side collision.

As shown in the figure, the overlapping area 19 of the main chamber area 12A and the sub-chamber area 12B serves as a curtain bag body 12 to be inflated and expanded at the thickest thickness in the vehicle interior direction. In other words, the overlapping region 19 of the main chamber region 12A and the sub-chamber region 12B expands as the region 24 of the curtain bag body 12 that protrudes most toward the vehicle interior.

With this configuration, when the head 22 of the occupant moves to the outside of the vehicle interior due to the oblique collision, the head 22 of the occupant can be received and supported in a substantially front state by the protruding region 24 of the primary chamber region 12A and the secondary chamber region 12B. Further, the head 22 of the occupant is prevented from rotating in the yaw direction, and the head 22 of the occupant can be more reliably protected.

In the present embodiment, as described in embodiment 1, the region of the overlap region 19 where the thickness of the curtain bag body 12 is the thickest is disposed at the roof side rail 10 or the a pillar 6 near the roof side rail 10. Therefore, the a-pillar 6 that enters the field of view of the driver is prevented from being enlarged, the field of view of the driver is less likely to be obstructed by the a-pillar 6, and deterioration of safety during traveling can be prevented.

An airbag device according to embodiment 3 of the present invention will be described in detail below with reference to the drawings.

Fig. 4(a) is a side view as viewed from the vehicle interior side for explaining a state when the curtain bag body is inflated and expanded, fig. 4(B) is a side view for explaining a state before the curtain bag body shown in fig. 4(a) is attached to the vehicle, and fig. 4(C) is a plan view for explaining a state when the curtain bag body on the driver seat side is inflated and expanded.

In this embodiment, the difference from embodiment 1 described with reference to fig. 1 and 2 is that the shape of curtain bag body 12 is linear in the front-rear direction of vehicle 1, and the other configuration is the same as embodiment 1. Therefore, the same reference numerals are used for the same components as those in embodiment 1 described with reference to fig. 1 and 2, and the description thereof will be omitted.

As shown in fig. 4(a), a curtain bag body 31 on the front side of the vehicle 1 is folded back from the vehicle interior side to the upper side of the vehicle 1, and is fixed to the a pillar 6 by 2 fixing tabs 14 disposed on the front end side. That is, curtain bag 31 is disposed in vehicle 1 in a state of being twisted in the vertical direction on the front side of vehicle 1.

As shown in fig. 4(B), curtain bag 31 is a substantially rectangular bag elongated in the front-rear direction of vehicle 1, and is formed in a linear shape. The curtain bag body 31 has an inflated portion 17 into which gas from the gas generator 13 (see fig. 1) flows and is inflated, and a non-inflated portion 18 into which gas does not flow and which is not inflated and expanded.

The curtain bag body 31 has: a main chamber area 31A disposed mainly below the roof side rail 10, and a sub-chamber area 31B located on the front side of the main chamber area 31A and mainly below the a-pillar 6.

In the boundary region between main chamber region 31A and sub-chamber region 31B, the region is separated from the upper end of curtain bag body 31 in most regions, and the lower end side expanded portion 17 of curtain bag body 31 is narrowed and communicated.

As shown in fig. 4(C), main chamber region 31A and sub-chamber region 31B are in contact with each other in overlap region 19 so as to overlap each other in the vehicle interior direction, and curtain bag body 31 is inflated and expanded thick toward the front side of vehicle 1. Then, a recessed region 32 for receiving the head 33 of the occupant is formed in the overlapping region 19 of the main chamber region 31A and the sub-chamber region 31B.

With this structure, when the head 33 of the occupant moves toward the outside of the vehicle compartment due to an oblique collision, the head 33 of the occupant can be received and supported in a substantially front state by the recessed region 32. Further, the head 33 of the occupant is prevented from rotating in the yaw direction, and the head 33 of the occupant can be more reliably protected.

In the present embodiment, as described in embodiment 1, the region of the overlap region 19 where the thickness of the curtain bag body 31 is the thickest is disposed at the roof side rail 10 or the a pillar 6 near the roof side rail 10. Therefore, the a-pillar 6 that enters the field of view of the driver is prevented from being enlarged, the field of view of the driver is less likely to be obstructed by the a-pillar 6, and deterioration of safety during traveling can be prevented.

An airbag device according to embodiment 4 of the present invention will be described in detail below with reference to the drawings.

Fig. 5(a) is a side view as viewed from the vehicle interior side for explaining a state when the curtain bag body is inflated and expanded, and fig. 5(B) is a plan view for explaining a state when the curtain bag body on the driver seat side is inflated and expanded.

In this embodiment, the point is that the curtain bag body 31 is bent outward in the vehicle interior as compared with embodiment 3 described with reference to fig. 4, and the other configuration is the same as that of embodiment 1 and embodiment 3. Therefore, the same reference numerals are used for the same components as those in embodiment 1 and embodiment 3 described with reference to fig. 1, fig. 2, and fig. 4, and the description thereof will be omitted.

As shown in fig. 5(a), in the present embodiment, the sub-chamber region 31B of the curtain bag body 31 is folded back from the vehicle interior side to the upper side of the vehicle 1, and is fixed to the a pillar 6 by 2 fixing tabs 14 disposed on the front end side.

As shown in fig. 5(B), when curtain bag 31 expands and expands due to an oblique collision, sub-chamber region 31B expands in a twisted state so as to be located outside the vehicle interior with respect to main chamber region 31A.

As shown in the figure, the overlapping area 19 of the main chamber area 31A and the sub-chamber area 31B serves as a curtain bag body 31, and is inflated and expanded at the thickest thickness in the vehicle interior direction. In other words, the overlapping region 19 of the main chamber region 31A and the sub-chamber region 31B expands as the region 34 of the curtain bag body 31 that protrudes most toward the vehicle interior.

With this configuration, when the head 33 of the occupant moves to the outside of the vehicle interior due to the oblique collision, the head 33 of the occupant can be received and supported in a substantially front state by the protruding region 34 of the primary chamber region 31A and the secondary chamber region 31B. Further, the head 33 of the occupant is prevented from rotating in the yaw direction, and the head 33 of the occupant can be more reliably protected.

In the present embodiment, as described in embodiments 1 and 3, the region of the overlap region 19 where the curtain bag body 31 has the thickest thickness is disposed at the roof side rail 10 or the a pillar 6 near the roof side rail 10. Therefore, the a-pillar 6 that enters the field of view of the driver is prevented from being enlarged, the field of view of the driver is less likely to be obstructed by the a-pillar 6, and deterioration of safety during traveling can be prevented.

In addition, although the description has been given of the airbag devices on the driver's seat side in embodiments 1 to 4, the present invention is not limited to this case. The airbag device for a front passenger's seat has the same configuration as that described above, and can obtain the same effects. In addition, various modifications may be made within a scope not departing from the gist of the present invention.

Claims

1. An airbag device characterized by comprising:

a curtain bag body disposed along the roof side rail from the front pillar of the vehicle,

a tab disposed at an upper edge of the curtain pocket and securing the upper edge of the curtain pocket to the upper sill along the upper sill; and

a tab disposed at a front edge of the curtain bag body and fixing the front edge of the curtain bag body to the front pillar along the front pillar,

the curtain bag body has, in an unfolded state before being mounted in a vehicle: a first region portion in which a first expansion portion arranged below the roof side rail is formed; and a second region portion in which a second inflation portion that communicates with the first inflation portion and is disposed on the front pillar side of the first inflation portion is formed, wherein a non-inflation portion that does not flow in gas and does not inflate and expand projects downward from an upper end portion of the curtain bag body in a boundary region between the first inflation portion and the second inflation portion,

the second region portion is fixed to the front pillar by the gusset when the second region portion is mounted in the vehicle, the second region portion being folded back while the front edge of the second region portion of the curtain bag body is twisted toward the front pillar side and upward of the vehicle, so that the second region portion is expanded after being mounted in the vehicle

A part of the second expansion portion overlaps with the first expansion portion in a vehicle width direction of the vehicle, and

the curtain bag body has, in an intermediate portion thereof, a region where the first region portion and the second region portion overlap, and in this overlapping region, an overlapping region of the first inflation portion and the second inflation portion is smaller than an overlapping region of the non-inflation portion and the second inflation portion.

2. The airbag device according to claim 1, characterized in that the curtain bag body has a first face and an opposite second face, the first face of the first region portion facing the vehicle interior side and the second face of the second region portion facing the vehicle interior side.

3. The airbag device according to claim 1, wherein the second region portion is folded back toward a vehicle-interior side in a vehicle width direction of the vehicle.

4. The airbag device according to claim 1, wherein the second region portion is folded back toward a vehicle outer side in a vehicle width direction of the vehicle.